1. An optical device for projecting images of celestial bodies and other astronomical phenomena onto the inner surface of a hemispherical dome. 
   天象仪一种能将天体和其它天文学现象的影象投射到半球状圆屋顶内表面的光学设备
2. The scientific study of matter in outer space, especially the positions, dimensions, distribution, motion, composition, energy, and evolution of celestial bodies and phenomena. 
   天文学外层空间事物的科学研究，尤指天体及天文现象的位置、大小、分布、运动、构成、能量及演化的科学
3. distance of celestial bodies 
   天体的距离
4. history of celestial body 
   天体史
5. optical phenomena in lakes 
   湖水光学现象

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